Which interface does java.util.Hashtable implement?

Which statement is true about an anonymous inner class?

Otput of following code? StringBuilder sb = new StringBuilder('UpWork'); sb.insert(6,'-'); sb.insert(0,'-'); sb.insert(4,''); System.out.println(sb);

Output of following program? class Upwork { public static void main(String [] args) { int x = 0x80000000; System.out.print(x + ' and '); x = x >>> 31; System.out.println(x); } }

Output of the given program? public class Test122 { public static void main(String[] args) { int i = 0; i = i++; i = ++i; i = i++; System.out.println(i); } }

Which is a method of a wrapper Integer for obtaining hash code for the invoking object?

Output of the given console application? public class Main { public static void main(String[] args) { final int X = 9; int[][] a = {{5, 4, 3}, {9, 7, 2}, {1, 6, 8}}; for (int i=0; i<3; i++) { for (int j=0; j<3; j++) { if (a[i][j] == X) break; System.out.print(a[i][j] + ' '); } } } }

Which keyword is used for manually throwing an exception?

Which statement is true? (Choose all that apply)

Output of the following program? class Upwork{ public static void main(String args[]) { int x , y; x = 10; x++; --x; y = x++; System.out.println(x + ' ' + y); } }

Which is valid java identifiers? (check any that apply) A. Up$Work B. _UpWork C. true D. Up.Work E. Public F. 1980_s